It measure the degree of accuracy of the sample mean as an estimate of the population mean​

Properties of the Sampling Distribution of Sample MeanThe standard deviationσ´Xof the sampling distribution of the sample means is also known as the standard error of the mean. It measures the degree of accuracy of the sample mean´X¿) as an estimate of the population mean (µ).

answer: are you

step-by-step explanation:

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.